const vscode = require("vscode");
const path = require("path");
const fs = require("fs");
const getCommits = require("./git");

// this method is called when your extension is activated
// your extension is activated the very first time the command is executed

/**
 * @param {vscode.ExtensionContext} context
 */
function activate(context) {
  // The command has been defined in the package.json file
  // Now provide the implementation of the command with  registerCommand
  // The commandId parameter must match the command field in package.json
  let disposable = vscode.commands.registerCommand(
    "extension.git-file-history",
    function() {
      // The code you place here will be executed every time your command is executed
      try {
        const currentPath = getCurrentPath();
        if (!currentPath) {
          vscode.window.showInformationMessage("No active file");
          return;
        }

        const panel = vscode.window.createWebviewPanel(
          "gfh",
          `${path.basename(currentPath)} (Git History)`,
          vscode.ViewColumn.One,
          {
            enableScripts: true,
            retainContextWhenHidden: true,
            localResourceRoots: [
              vscode.Uri.file(path.join(context.extensionPath, "site"))
            ]
          }
        );
        const indexPath = path.join(
          context.extensionPath,
          "site",
          "index.html"
        );

        const index = fs.readFileSync(indexPath, "utf-8");

        getCommits(currentPath)
          .then(commits => {
            const newIndex = index
              .replace(
                "<script>window._CLI=null</script>",
                `<script>/*<!--*/window._CLI={commits:${JSON.stringify(
                  commits
                )},path:'${currentPath}'}/*-->*/</script>`
              )
              .replace(
                "<head>",
                `<head><base href="${vscode.Uri.file(
                  path.join(context.extensionPath, "site")
                ).with({
                  scheme: "vscode-resource"
                })}/"/>`
              );

            panel.webview.html = newIndex;
          })
          .catch(console.error);
      } catch (e) {
        console.error(e);
        throw e;
      }
    }
  );

  context.subscriptions.push(disposable);
}

function getCurrentPath() {
  return (
    vscode.window.activeTextEditor &&
    vscode.window.activeTextEditor.document &&
    vscode.window.activeTextEditor.document.fileName
  );
}

exports.activate = activate;

// this method is called when your extension is deactivated
function deactivate() {}

module.exports = {
  activate,
  deactivate
};
